Safe Haskell	None
Language	Haskell2010

Database.PostgreSQL.Tx.HEnv

Synopsis

Documentation

data family HEnv (l :: [*]) infixr 2 Source #

Glorified hlist used to construct ad hoc tx runtime environments.

Instances details

Select a xs => TxEnv a (HEnv xs) Source #	`TxEnv` instance for `HEnv`; selects the first `a` in the `HEnv` and makes it available via the runtime environment. Since: 0.2.0.0
Instance details Defined in Database.PostgreSQL.Tx.HEnv Methods lookupTxEnv :: HEnv xs -> a Source #
data HEnv ('[] :: [Type]) Source #
Instance details Defined in Database.PostgreSQL.Tx.HEnv data HEnv ('[] :: [Type]) = Nil
data HEnv (x ': xs) Source #
Instance details Defined in Database.PostgreSQL.Tx.HEnv data HEnv (x ': xs) = x `Cons` (HEnv xs)

Construct an HEnv containing a single value.

Since: 0.2.0.0

fromTuple :: FromTuple i o => i -> HEnv o Source #

Construct an HEnv from the given tuple i. Instances support tuples of up to 16 elements.

Since: 0.2.0.0